• Design Considerations for Networked Data Acquisition Systems

      Cranley, Nikki; Corry, Diarmuid; ACRA Control Inc. (International Foundation for Telemetering, 2009-10)
      Ethernet technology offers numerous benefits for networked Flight Test Instrumentation (FTI) systems such as increased data rates, flexibility, scalability and most importantly interoperability owing to the inherent interface, protocol and technological standardization. However, the best effort nature of Ethernet is in sharp contrast to the intrinsic determinism of tradition FTI systems. The challenge for network designers is to optimize the configuration of the Ethernet network to meet the data processing demands in terms of reliability and latency. This paper discusses the necessary planning and design phases to investigate, analyze, fine-tune and optimize the networks performance.
    • Networked Flight Test Instrumentation Data Recording Solutions

      Cranley, Nikki; Corry, Diarmuid; ACRA Control, Inc. (International Foundation for Telemetering, 2009-10)
      An integral component of networked Flight Test Instrumentation (FTI) and Health and Usage Monitoring Systems (HUMS) is the networked Data Recorder. The high data rates achievable in networked data acquisition systems put increased demands on the recorder to support ever faster read and write rates. Key to the success of the networked recorder is the format in which the data is recorded. The data recording file format should be network-centric with a low processing overhead to support the recording demands. In this paper the popular file formats, Chapter 10 and the Packet CAPture (PCAP), that are used for recording networked FTI are analyzed and compared.